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HVAC Ohming Compressor Windings
Posted by: DrZarkloff

Video duration: 262 seconds
Global video hits: 80377

I show how to ohm compressor windings to see if the compressor checks out electrically.

Related: drzarkloff, starkloff, hvacr, betterthanbob, air, conditioning, hvac, compressor, ohm

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Latest comments made on this video:

@Nspect I was a ...
By: jesusnagstring. on 20 Aug 10, 17:18:53
@Nspect I was a HVAC tech for over 10yrs and still work on the side for myself as a tech. I always ohm out the compressor at the terminals. As he says this eliminates any false readings through the wiring. As for the terminal blowing knocking your hand into a live circuit you should NEVER have the power on when ohming a compressor at the terminals in the first place. You can also do a continuity check to see if the compressor is shorted to ground.

I agree IndieBraah, ...
By: Nspect. on 16 Aug 10, 03:05:04
I agree IndieBraah, never do directly at the compressor if it blew out could kick your hand into a live circuit or hurt you.........

@IndieBraah I've ...
By: DrZarkloff. on 15 Aug 10, 16:59:35
@IndieBraah I've never had it happen to me. I like to ohm the compressor at the terminal block just in case there's a problem with any of the wires.

Thanks for this ...
By: DaVeHoLpRiDe. on 15 Aug 10, 12:04:51
Thanks for this video mate it helped alot

@deyenak1 that is ...
By: ppwalk05. on 14 Aug 10, 21:09:19
@deyenak1 that is if you are doing a hipot test using a megohmmeter (resistance to ground using a high voltage dc source).

DrZarkloff I have a ...
By: IndieBraah. on 14 Aug 10, 18:39:02
DrZarkloff I have a question. In the video you pull the compressor leads off of the terminals directly to ohm them out. I have been always told that you should never do this unless the charge is pulled out of the system because, the terminals can shoot out and blow your hand off while the system is under pressure. I'm only a 4? year tech from So.Cal. Just wondering if that is a myth or true what they say?

@george6964 The ...
By: DrZarkloff. on 12 Aug 10, 01:59:25
@george6964 The continuity setting is used to read ohms on the Fieldpiece HS33. The Fieldpiece HS36 has separate settings for each.

on ohming ...
By: george6964. on 10 Aug 10, 22:52:20
on ohming compressor i noticed you have your meter set to continuity to to ohms does it matter

@baydestrian84 A ...
By: douglas787. on 30 Jul 10, 23:33:26
@baydestrian84 A shock from a 440v unit is no freekin joke. Could cause death or at the least serious burns. I use one of those non contact probes just to be sure the power is off. I almost shocked myself on a attic air handler the other day on a multi unit building. I shut off the wrong breaker, good thing I checked with the probe before putting my hands in there.

@baydestrian84 ...
By: DrZarkloff. on 24 Jul 10, 14:14:45
@baydestrian84 Yeowch! Amen to that.

yes i thought i ...
By: baydestrian84. on 24 Jul 10, 06:28:06
yes i thought i turned off the power two days ago on a three phase 460v packeg unit.and the next thang i no i was stuck to the unit and yelling at the top of my lungs..not fun thank god i have some waight on my bones cus i was on able to pull my hands off.. scared the shi_ out of me. so pleas all tecs and installers dont trust outher pepoles work or word check for voltege..thnx

@robertcyders I'm ...
By: DrZarkloff. on 14 Jul 10, 23:10:37
@robertcyders I'm not sure. You could test the scroll compressor in the same manner as long as it's single phase. Three phase compressor should ohm the same between each winding.

@2170509 The valve ...
By: DrZarkloff. on 14 Jul 10, 23:08:31
@2170509 The valve could have got stuck if a piece of trash clogged the orifice. Sometimes, an oil flood back can simulate a stuck valve. By the way, I prefer Sporlan expansion valves. Enough said.

Look at 1:47 in the ...
By: robertcyders. on 13 Jul 10, 20:21:40
Look at 1:47 in the video. You have your HS33 Fieldpiece meter set on continuity. You have a tone, a light, and the knob is pointing to this setting. I have the same meter. What should you be reading on ohms on a scroll compressor let's say 4 tons?

Sir, I have ...
By: 2170509. on 10 Jul 10, 20:19:24
Sir, I have installed Petra chiller its expansion valve got stuck 05 to 06 times in two years there is installed Danfoss SS body valve, Please reply what cause of getting stuck the expansion valve. Regards M. Ismail

@juanater2000 It ...
By: DrZarkloff. on 01 Jul 10, 00:30:07
@juanater2000 It should be running until the indoor temperature reaches the thermostat set point. Your system could be shutting off on high head pressure. Try cleaning the condensing coil.

@deyenak1 I've ...
By: DrZarkloff. on 30 Jun 10, 23:14:22
@deyenak1 I've never known that to happen. I have had a compressor blow out after energising it with power.

@2170509 You should ...
By: DrZarkloff. on 30 Jun 10, 23:12:41
@2170509 You should just weigh in the refrigerant charge. Don't be too concerned with the suction pressure unless it's too low and the line is icing up.

Sir, I have ...
By: 2170509. on 30 Jun 10, 19:49:16
Sir, I have installed 1/2 hp compressor Danfoss 134 a in fridge its getting to heated and compressor return came means suction line temp. came at above 20 psi I read in book at 80 Fahrenheit, suction allowable temp 30 to 20 Psi so 20 psi pressure of suction line is it suitable? Please Reply Dr. Zarkloff

were those ...
By: deyenak1. on 30 Jun 10, 04:18:31
were those compressors under pressure because my teacher say's that checking ohms at the terminals on the compressor might blow out on you. What can you tell me about that

me again house is ...
By: juanater2000. on 29 Jun 10, 07:07:09
me again house is 1700sq ft 4 ton unit

me agail house is ...
By: juanater2000. on 29 Jun 10, 07:04:33
me agail house is 1700sq ft 4ton carrier unit

Hi i was adjusting ...
By: juanater2000. on 29 Jun 10, 07:00:18
Hi i was adjusting my swing setting and wondering my unit runs about 14min on and 14 min off . 100f out side. i know theres alot more to factor in but what do you think about that? would it be more efficent to run on say 10 min ? how long should it run at that outside temp aproxx? thanks

Resistance ...
By: tangnatalaga. on 22 Jun 10, 16:50:33
Resistance measurement cannot determine a shorted coil. I mean any type of coil specially the ones in a compressor. Although it can determine an open winding which rarely happens. A ring test can be performed using an oscilloscope and a signal. Even then it is not 100% reliable. I don't even know why some technical books have sections in measuring Resistance in coils. It is useless and a waste of time and may lead to confusion.

Hi, Please make me ...
By: 2170509. on 18 Jun 10, 16:31:04
Hi, Please make me know, can we charge the gas in the system with gas? when we know TR of the system I am talking about gas quantity in weight I know when the system RFT increase gas quantity also increase but is there available thumb rule when capacity so and so then quantity so and so. Regards

HVAC Wiring Diagrams 101
Posted by: DrZarkloff

Video duration: 223 seconds
Global video hits: 78012

This is a basic run down about wiring diagrams. The music was played and composed by Champagne Millionaire. You can check him out at: profile.myspace.com

Related: drzarkloff, starkloff, hvacr, betterthanbob, air, conditioning, hvac, wiring, diagrams

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Latest comments made on this video:

@DeNarbone You ...
By: DrZarkloff. on 04 Sep 10, 22:40:27
@DeNarbone You could try one of the HVAC stop leaks. I'm planning on doing a video on a couple of them soon.

DrZarkloff, thx for ...
By: DeNarbone. on 01 Sep 10, 19:59:15
DrZarkloff, thx for educating us w/ your videos. I've spent $500 & my ac is still not working. Per tech guy it's losing freon through evaporator although his leak detector doesn't detect any leak. The evaporator has never been distort and it looks very clean (almost like new), except for some rust on the sides where he thinks it's leaking. Well, since my sys is 14y old his remedy is for me to buy a new unit rather than buying another evap only under the suspicion of a leak. Your 2 cents please.

@KOxDisturbance ...
By: smashsamus. on 15 Aug 10, 15:10:52
@KOxDisturbance the only "drop-in" replacement for R12 is R134a. but you must retrofit the system because of the differences in pressures and characteristics between the to refrigerants. exp. you'll need to replace the service ports on your hard lines to R134a type, evaporator, receiver/accumulater dryer etc..

@KOxDisturbance I ...
By: DrZarkloff. on 12 Aug 10, 01:57:20
@KOxDisturbance I don't know of any good drop in replacements for automotive R12. Hot Shot has Butane in it so that's out of the question. I'm not really sure about what you mean by B common or B energise.

@spok209 If you can ...
By: DrZarkloff. on 12 Aug 10, 01:51:17
@spok209 If you can do basic addition, subtraction, multiplication and division then you're good.

Im interested in ...
By: spok209. on 11 Aug 10, 03:37:25
Im interested in signing up for HVAC tech classes but Im wondering if you need to be really good in mathematics to fully understand the whole thing.?

@DrZarkloff Thanks. ...
By: KOxDisturbance. on 10 Aug 10, 22:37:36
@DrZarkloff Thanks. Do you know what if any type of drop ins CAN be used for automotive? Also where can we locate and differentiate between "B" common with "B" energize?

@KOxDisturbance R- ...
By: DrZarkloff. on 05 Aug 10, 20:19:11
@KOxDisturbance R-414b, commonly known as Hot Shot, can be used as a drop in replacement for R-12. Although, R-414b cannot be used in automotive applications because of the butane that is in R-414b. There are a couple of drop in replacements for R-22. For starters, there's R422a for low and medium temperature applications and there's R-422d for high temperature applications. Then there's NU-22.

Can you demonstrate ...
By: KOxDisturbance. on 05 Aug 10, 04:43:36
Can you demonstrate how to convert an r-12 unit into a r 414 if compatible? Maybe an r 22 unit into an r 414? Since the EPA has been barring the use of these refrigerants they will need to be converted on old units unless they are just used for scrap when they become a hassle for the owners. Maybe even this new refrigerant mix can be used to replace old r12 or r22 units? Any info? Thanks in advance your videos are excellent learning tools.

i have a question ...
By: georgexiong1. on 28 Jul 10, 00:23:59
i have a question to ask about a transformer? i have 240 vac going in and 120 vac coming out..but when i checked the low voltage coil there's nothing...is the transformer bad and the unit is not turning on at all....can u give me some hints...please i need help....you can email me at georgewxiong@hotmail.com

i have a question ...
By: georgexiong1. on 28 Jul 10, 00:23:10
i have a question to ask about a transformer? i have 240 vac going in and 120 vac coming out..but when i checked the low voltage coil there's nothing...is the transformer bad and the unit is not turning on at all....can u give me some hints...please i need help....you can email me at georgewxiong@hotmail.com thanks

@YummyMercury It's ...
By: DrZarkloff. on 25 Jul 10, 15:50:16
@YummyMercury It's a commercial Addison heat pump.

a three phase air ...
By: YummyMercury. on 24 Jul 10, 22:52:28
a three phase air conditioner? where did you take the outdoor parts of the video?

great job , thanks ...
By: Nycnetwork. on 18 Jul 10, 16:36:06
great job , thanks a lot .

@MustangWW2 Thanks ...
By: DrZarkloff. on 17 Jul 10, 19:02:23
@MustangWW2 Thanks for watching.

@Haze2c Please ...
By: DrZarkloff. on 17 Jul 10, 19:01:51
@Haze2c Please check out the HVAC Honeywell Prestige video.

can you make a vid ...
By: Haze2c. on 08 Jul 10, 23:16:48
can you make a vid of how to wire the t-stat and cond. in the Air handler on a straight cool system?

Usually wiring ...
By: MustangWW2. on 07 Jul 10, 04:22:39
Usually wiring diagrams scare me, but the the focus of a diagram being a type of road map will help while in lecture. You are a good technition Dr. Z

Good straight ...
By: dagwoody. on 29 Jun 10, 02:02:32
Good straight forward teaching. Could have done it better!

Good straight ...
By: dagwoody. on 29 Jun 10, 02:01:57
Good straight forward teaching. Could have done it better!

@dh0452 You might ...
By: DrZarkloff. on 27 Jun 10, 17:05:52
@dh0452 You might have. I work on a lot of belt driven blowers.

did I hear a loose ...
By: dh0452. on 27 Jun 10, 10:51:17
did I hear a loose belt squeeling back there ?

@MeyerG4Indiana ...
By: DrZarkloff. on 08 Jun 10, 23:27:02
@MeyerG4Indiana Thanks for watching.

Honestly the best ...
By: MeyerG4Indiana. on 08 Jun 10, 03:03:37
Honestly the best video/ fastest information input I've ever experienced. You've got the knack.

hey DrZarkloff ...
By: 1416trunks. on 25 May 10, 02:39:58
hey DrZarkloff thanks so much for sharing your knowlegde its help a lot for all who those want to learn about HVAC!!! thanks i learn a lot!!!

HVAC recovery system hook-up and hose purge
Posted by: DrZarkloff

Video duration: 458 seconds
Global video hits: 90286

I show how to connect and purge hoses when recovering refrigerant from an a/c system. Please do not be confused by the R-410A gauges. My R-22 gauges were broken and I was forced to use my R-410A gauges.

Related: drzarkloff, starkloff, hvacr, betterthanbob, air, conditioning, hvac, recovery, unit, hose, purge

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Latest comments made on this video:

@orbtaybal If you ...
By: DrZarkloff. on 26 Aug 10, 21:01:03
@orbtaybal If you have oil close to where you connect the hoses you could get oil.

@orbtaybal I use ...
By: DrZarkloff. on 26 Aug 10, 20:59:54
@orbtaybal I use low loss fittings. I disconnect the high pressure hose first then cross over the refrigerant in the high pressure hose to the suction side. It helps to reduce refrigerant loss.

How do you purge ...
By: orbtaybal. on 26 Aug 10, 09:24:37
How do you purge your hoses when taking them off, so as to not get sprayed? I'm assuming I could just front seat the discharge service valve? open the valves on my gauges and let it flow through to the suction..I know using low loss will help along with ball valve extensions. I remember us doing it in class but I totally forgot. Also some of these manifolds can have almost a pound of refrigerant still in them, like the zepplin for example.

I heard that low ...
By: orbtaybal. on 26 Aug 10, 09:19:52
I heard that low microns you will start pumping out oil.

@crownvvc4 Yes, I ...
By: DrZarkloff. on 26 Aug 10, 00:20:38
@crownvvc4 Yes, I do a lot off camera.

got a question... ...
By: crownvvc4. on 25 Aug 10, 20:22:53
got a question...how come when you got down to 500 microns ..well in this case 130..arent you suppose to turn the vaccum pump off and wait five minutes and make sure that 500 microns holds there so you know there isnt any leaks in the system before charging?

@texsales01 no no ...
By: artistjja. on 24 Aug 10, 02:50:38
@texsales01 no no no no no

@vancouversignman ...
By: orbtaybal. on 15 Aug 10, 14:11:30
@vancouversignman Not only are you and idiot in that you are killing our ozone, but recovery is necessary as a financial reason so you don't have to buy more.

I don't bother to ...
By: vancouversignman. on 11 Aug 10, 04:35:07
I don't bother to recover it, just dump it to the enviroment

@vabeach1989 You ...
By: DrZarkloff. on 09 Aug 10, 23:10:44
@vabeach1989 You might want to add two pounds of liquid refrigerant per ton as a static charge before switching to vapor.

im agreed with you ...
By: laloludena. on 09 Aug 10, 07:23:24
im agreed with you doc 10pounds but somethings its not accurate because of the side of the line sets may be longer and need more rerigerant. so subcooling or superheat is always good to check.

@DrZarkloff in a ...
By: vabeach1989. on 08 Aug 10, 17:18:00
@DrZarkloff in a split system how much initial liquid r-22 to add before switching to vapor. I am working on a newly put together system without any refrigerant and wondering which way to go. As always your videos are great.

@texsales01 No. ...
By: DrZarkloff. on 02 Aug 10, 23:27:58
@texsales01 No. Virgin bottles have check valves on them that prevent you from refilling them.

Hi can you use a ...
By: texsales01. on 02 Aug 10, 05:28:48
Hi can you use a empty R22 can to recover also? thanks

Hi can you use a ...
By: texsales01. on 02 Aug 10, 05:26:39
Hi can you use a empty R22 tank to recover 22 also?

Thats how I ...
By: tangnatalaga. on 28 Jul 10, 18:32:29
Thats how I attached it too, but on my yellow jacket recovery it shows having the yellow service hose going to the liquid service port. Then the blue one goes to the suction port of the recovery machine via a reciever dryer. Then the discharge of the recovery machine goes to the recovery tank and for some reason the red hose goes to the tank as well. The Red valve is closed the blue valve is open. Its called a push pull or something. Very confusing so I just do it the way you show on the video.

@viperspeed172019 ...
By: DrZarkloff. on 17 Jul 10, 18:46:38
@viperspeed172019 Thanks for watching. You can add the initial charge to the system by the liquid side. Then you have to fine tune the charge by vapor in the suction side.

@ariotto1 Its ...
By: petesque. on 15 Jul 10, 19:01:05
@ariotto1 Its really simple. Cylinder upside down and at a lower level that the compressor. Bleed liquid refrigerent up to your gages. Then open the high side all the way and walk away. I get a smoke. Come back close off the valve and fire up the unit. Only a few time in 20 years have had to top off with vapor. Bur that was easy because my cylinder line was full of liquid. Thid will work on any HVAC system.

hey doc z!! ...
By: viperspeed172019. on 15 Jul 10, 03:18:48
hey doc z!! awesome videos....question for ya ....i see you add freon to this system from the high side ...liquid...do you recommend this practice whenever you charge a system?? thanx....your vids are killer!!!!!

@petesque can u ...
By: ariotto1. on 13 Jul 10, 03:28:40
@petesque can u explain that trick better? i really would like to try that!

@Khmerica26 Tonnage ...
By: DrZarkloff. on 27 Jun 10, 16:55:01
@Khmerica26 Tonnage is a measurement referring to BTU. There are 12,000 BTU per ton. See my HVAC Safety video to see what kind of equipment you need to do the job.

@DrZarkloff Thanks ...
By: Khmerica26. on 26 Jun 10, 22:03:58
@DrZarkloff Thanks for responding back. What is a tonnage? I haven't learn that in class yet. So does that mean I need a recovery charge unit to get the job done? What equipments do I need?

@Khmerica26 Take ...
By: DrZarkloff. on 26 Jun 10, 21:20:00
@Khmerica26 Take the tonnage and multiply it by 2. Then charge that amount with liquid for your static charge.

@DrZarkloff can ...
By: hamdad17. on 24 Jun 10, 09:04:36
@DrZarkloff can you please tell us approximately how much percent you need to fill from the high side and then from the low side after switching on the system?

@Khmerica26 I'd ...
By: DrZarkloff. on 22 Jun 10, 23:38:38
@Khmerica26 I'd replace the temperature control for a digital control. They're easier to keep the temperature where you want it.

HVAC (Coil Cleaning)
Posted by: DrZarkloff

Video duration: 596 seconds
Global video hits: 186448

This is a quick lesson in how to clean air conditioning coils. It is a very worthwhile video to watch. Pay close attention.

Related: drzarkloff, starkloff, james, allen, air, conditioning, conditioner, coil, cleaning, evaporator, condensor, save, money, hvacr

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Latest comments made on this video:

@DrZarkloff If you ...
By: BeeRich33. on 04 Sep 10, 22:40:26
@DrZarkloff If you make a lot of money, you know where to reach me. Heh.

@BeeRich33 I don't ...
By: DrZarkloff. on 04 Sep 10, 22:37:55
@BeeRich33 I don't know. I've never used meat tenderiser to clean coil. I might work. I guess it's worth a try.

@Chickeewaawaa The ...
By: DrZarkloff. on 04 Sep 10, 22:36:24
@Chickeewaawaa The coil cleaner would loosen up the cat fur so that it could be cleaned away from the coil.

@Chickeewaawaa Mix ...
By: BeeRich33. on 02 Sep 10, 07:09:15
@Chickeewaawaa Mix up some "Accent" in water for an application. It's meat tenderizer which has proper enzymes in it. I don't know if it will be acidic, so you might want to test it with some pH papers to see where she lies.

DrZ - my a/c guy ...
By: Chickeewaawaa. on 01 Sep 10, 13:36:58
DrZ - my a/c guy told me (this morning) that my coils are covered in cat fur - lovely, I know. He wants to charge me $288 for coil cleaning. Was wondering if the coil cleaner is going to take care of the cat fur or if I need another type of solvent. HELP!!

@KOxDisturbance I ...
By: DrZarkloff. on 31 Aug 10, 23:45:51
@KOxDisturbance I live in Florida. Sorry, I don't know any HVAC contractors in your area. Fractional horsepower motors should be replaced. Replacing windings and bearings is something you'd do on motors that are rated at 2 or more horsepower.

Do you know of any ...
By: KOxDisturbance. on 30 Aug 10, 15:40:03
Do you know of any good outfits to work for in Northern California? Also Those windings and the blower fan looked pretty old and worn how do you know when it would be time to replace them or when would you tell a customer it is time to replace the blower? Once I reach those dirty windings things look pretty bleak from my experience.

Zarkloff, you ...
By: klabkebash. on 27 Aug 10, 19:51:24
Zarkloff, you didn't show how to mix the coil cleaner with water... you don't use 100% and don't leave it on for too long..

you are an angel; ...
By: yaryshine. on 27 Aug 10, 02:33:10
you are an angel; Thank you very much*

you are an angel; ...
By: yaryshine. on 27 Aug 10, 02:17:29
you are an angel; Thank you very much*

I use that brown ...
By: JISINSANE3. on 25 Aug 10, 06:10:37
I use that brown shit on my a/c. A helpful tip, Don't spray your coils with no shirt on. Otherwise you will feel a nice buring sensation all over. I do it exactly like this video. I am a DIY homeowner.

Good video should ...
By: techman614. on 20 Aug 10, 03:48:05
Good video should do more

@iquit4gud Good ...
By: DrZarkloff. on 19 Aug 10, 20:51:55
@iquit4gud Good luck. I prefer to use the type of coil cleaner that you have to mix with water and spray with a pump sprayer.

thnks for the vid. ...
By: iquit4gud. on 18 Aug 10, 18:38:06
thnks for the vid. I have a question about cleaning the inside of a split unite. (in the house) I can't rinse it the way you did obviously. Will running the AC for a while clean all the junk. I bought an aresol coil cleander and degreaser spray, will that be enough. Another question. It says on the can, not to spray it on plastic. I might have a hard time gettting to every part of the coil if i don't spray on the plastic. Will it ruin anything, or are they just being extra careful?

cleaning an outside ...
By: hvguy. on 17 Aug 10, 10:10:46
cleaning an outside unit is all fine and dandy, but how would you go about cleaning a fur-down unit...

@GBoots9 You can ...
By: DrZarkloff. on 13 Aug 10, 23:06:12
@GBoots9 You can buy a condensing unit that has pre coated coils. They really are worth the extra money for people that live on the coast.

What do you ...
By: GBoots9. on 12 Aug 10, 18:09:09
What do you recommend for protecting a beach property coil? The salty air destroys the cooling fins after a few years. I was thinking about spraying it with WD40 weekly. What do you think?

Let me put you ...
By: eivyde. on 11 Aug 10, 09:10:32
Let me put you straight firstly if your outside condenser unit is under warranty you void your warranty once you open the unit with a screw driver.Believe me this will happen,why take the risk....amazing this guy has not notified viewers before undertaking to open condenser....

@jatontherun Thanks ...
By: DrZarkloff. on 10 Aug 10, 22:24:16
@jatontherun Thanks for watching.

Thanks so much! ...
By: jatontherun. on 10 Aug 10, 17:44:52
Thanks so much! Very helpful!! In a conversation with a coworker today, he alerted me to the maintenance needed on the coils. Thanks!

@williamsmom2 Your ...
By: XDACY. on 02 Aug 10, 06:08:18
@williamsmom2 Your indoor (evaporator coil) will usually rinse itself with the condensate that builds up on it. You can get a foaming coil cleaner in an aerosol can at the local 'orange' painted home improvement store chain. Works very good and as it states on the can, you can let the condensation rinse the coil. I like to use an engine de-greaser attachment on my air compressor. For the liquid coming up the suction tube, I substitute an alcohol/water mix. Alcohol is a good degreaser too.

@theo0327 You could ...
By: DrZarkloff. on 01 Aug 10, 14:43:22
@theo0327 You could remove the evaporator from the air handler for cleaning. Otherwise, you just have to work slow and careful.

Thanks doc you fa ...
By: bigchill46. on 31 Jul 10, 19:51:30
Thanks doc you fa man. I've learned a great deal from your videos

@milkphish2 You ...
By: DrZarkloff. on 31 Jul 10, 19:30:04
@milkphish2 You have to remove the evaporator from the coil box.

@bigchill46 Not at ...
By: DrZarkloff. on 31 Jul 10, 19:28:49
@bigchill46 Not at the moment. Thanks.

HVAC BTU and Ton
Posted by: DrZarkloff

Video duration: 217 seconds
Global video hits: 12057

I show how to calculate the tonnage raging based on the BTU information on a data label.

Related: drzarkloff, starkloff, hvac, tonnage, btu, data, label

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Latest comments made on this video:

@jlsalazar101 Yes, ...
By: DrZarkloff. on 31 Aug 10, 23:54:35
@jlsalazar101 Yes, the evaporator could ice up if the thermostat is left below 65 F.

@jlsalazar101 I'm ...
By: DrZarkloff. on 31 Aug 10, 23:32:56
@jlsalazar101 I'm glad to have helped.

@DrZarkloff You are ...
By: jlsalazar101. on 31 Aug 10, 13:25:05
@DrZarkloff You are the undisputed man it definetly was the blower motor. The curious thing was the amperage was good but I did notice the motor get real hot.When I took out the blower motor I noticed some play in the shaft...Thanks alot for the help..keep up the good work.

@DrZarkloff The ...
By: jlsalazar101. on 29 Aug 10, 21:11:13
@DrZarkloff The blower appeared to be working properly there was plenbty of air flowing through the vents. Someone lowers the thermostat way too low would this cause the line to freeze up.?

@jlsalazar101 You ...
By: DrZarkloff. on 28 Aug 10, 19:58:56
@jlsalazar101 You might want to check the blower wheel and motor to see if it's clean and working properly. Also, clean the evaporator coil. Even if it looks clean from the outside, it could be dirty on the inside.

Hello Dr Zarloff ...
By: jlsalazar101. on 28 Aug 10, 14:34:16
Hello Dr Zarloff this is the first posting addressed to you . Your knowledge is real extensive keep it up. I have a question perhaps you could help. My unit had a frosted suction line starting at the condenser and eventually it works its way to the evaporator. The low side psi is 54 and the high side is 260. My vent temp is around 49 degrees. All media is clean filter, evaporator etc. Besides a dirty filter or coil or low refrigerant what else would cause this problem?

Thank you....
By: thisisnotyours1. on 18 Aug 10, 03:35:38
Thank you....

@merodaryl Cool! ...
By: DrZarkloff. on 28 Jul 10, 23:10:08
@merodaryl Cool! That's a lot to learn.

Like always good ...
By: merodaryl. on 28 Jul 10, 22:12:38
Like always good stuff my man! keep them coming. I will be a master Tech before the summer"s out!

@apnaconstruction ...
By: DrZarkloff. on 15 Jul 10, 22:13:39
@apnaconstruction You should put about 2 pounds of refrigerant per ton of air before starting the system for a weigh-in charge or for superheat and subcooling charge.

so how many lbs r22 ...
By: apnaconstruction. on 11 Jul 10, 23:34:49
so how many lbs r22 i need to put in 3 ton unit there is any calculator for that ?? how to calculated freon to put in unit ?? Dr z thanks

@blissJesus1 You ...
By: DrZarkloff. on 22 Jun 10, 23:42:06
@blissJesus1 You could get a ductulator from a HVAC parts house. Just line up your duct size and cfms to get your friction rate. Friction rate is the amount of drag there is on the air flow.

dr. Z, I am ...
By: blissJesus1. on 18 Jun 10, 18:31:21
dr. Z, I am trying to wrap my mind around friction rates, with length of duct by size; for example' A duct is 40 ft. long, and is 6 in. by 9 in.. The quantity of air to be delivered is 400 cfm. What is the friction rate?. Is there a simple way to understand how to figure this out?, and thank you Dr. Z, your the best HVAC/ YOU TUBER.

@Aussie50 The ...
By: ArtistBlade1972. on 11 Jun 10, 22:04:39
@Aussie50 The refrigeration "ton" comes from ice. It takes 144 BTU to melt 1 lb of ice. A ton 2000lbs in the US would absorb 288,000 BTU in melting. The scale is based on it melting in a 24hr period which would be 288,000/24=12,000 So the ton of ice as it melts in one day's time would absorb 12000 BTU per hour

@whyms1 Yep, ...
By: djslay34982. on 06 Jun 10, 20:27:09
@whyms1 Yep, Usually you can call the manufacturer and ask how much more refrigerant needs to be added per foot of line set.

@DrZarkloff Does ...
By: whyms1. on 30 May 10, 01:50:38
@DrZarkloff Does the lenght of the line set effect the amount of gas needed to charge a HVAC system Mike Key West, Fl

@whyms1 the ...
By: DrZarkloff. on 29 May 10, 19:54:10
@whyms1 the refrigerant charge should always be weighed in with packaged systems. Split systems, with the exception of mini split systems, should be charged by superheat or subcooling.

how do you ...
By: whyms1. on 28 May 10, 01:59:00
how do you calculate the amount of refreg gas to put in a system when rechargeing a hvac system

@yantur52 Thanks ...
By: DrZarkloff. on 15 May 10, 13:20:33
@yantur52 Thanks for watching.

You r the best ...
By: yantur52. on 14 May 10, 03:16:14
You r the best teacher that I see at this time for real thanks to be here.

@uchemp I live in ...
By: DrZarkloff. on 12 Apr 10, 21:48:10
@uchemp I live in High Springs, Florida. I was born in Ohio, raised in Arizona and I've lived in Florida nearly all of my adult life.

Here are you from?
By: uchemp. on 09 Apr 10, 21:06:45
Here are you from?

@DrZarkloff ill ...
By: death2opposeme. on 31 Mar 10, 04:28:53
@DrZarkloff ill have to see how its done at a few of our customer's buildings... and come back to you on that. there rough. even our experienced tech who can handle em, hates them to hell and back lol.

@death2opposeme All ...
By: DrZarkloff. on 28 Mar 10, 16:40:26
@death2opposeme All of the zoning controls that I work on are by computer. Alerton is the most common.

zone control ...
By: Tranic85. on 23 Mar 10, 13:29:34
zone control systems just flat out dont work. they cant keep up in the summer time.

HVAC gauges
Posted by: DrZarkloff

Video duration: 368 seconds
Global video hits: 61078

This is a tutorial about air conditioning gauges.

Related: starkloff, james, allen, air, conditioning, guages, psig, hg

Display Video Comments | Hide Video Comments | Add Comment

Latest comments made on this video:

i might be wrong ...
By: peanuttbutterman. on 01 Sep 10, 20:18:11
i might be wrong but arent low loss fitting required by EPA?

@vishwarajesh ...
By: DrZarkloff. on 29 Aug 10, 16:54:52
@vishwarajesh That's a pretty tall order. It would take me many long videos to explain how to do a heat load calculation in full detail. I don't even have all of the books and computer programs that would be necessary.

hello sir please ...
By: vishwarajesh. on 20 Aug 10, 05:56:57
hello sir please explain me for heat load calculation full detail

@GregWorrix I'm ...
By: DrZarkloff. on 15 Jul 10, 23:24:53
@GregWorrix I'm pretty much a fan of CPS and Yellow Jacket.

What are good brand ...
By: GregWorrix. on 12 Jul 10, 03:00:02
What are good brand names to buy?

Why does that set ...
By: batmmannn. on 03 Jul 10, 06:12:41
Why does that set of guages have 2 ports for each color hose? The other guage you have there only has one port for each? What are the extra set of ports for?

thanks, Doc for ...
By: falconninja1211. on 02 Jul 10, 04:19:14
thanks, Doc for responding I can't wait see ya! thanks, John(Portland,Oregon)

@falconninja1211 ...
By: DrZarkloff. on 30 Jun 10, 23:07:22
@falconninja1211 I'm planning to show that in my next video. Thanks.

hey, thanks for all ...
By: falconninja1211. on 30 Jun 10, 22:01:16
hey, thanks for all your videos and sharing to the rest of the world. I have a question how to properly and what you advice how to return refrig. back to the system say to the suction side when your ready to disconnect the manifolds, so i do not waste refrig. also, what to look for on the gauges in the process before disconnecting manifolds. thanks, john

@davemustainee2 The ...
By: DrZarkloff. on 22 Jun 10, 23:59:19
@davemustainee2 The amount of subcooling is the temperature difference between the inlet and the outlet of the condensing coil.

Hi, Dr. Z ...
By: davemustainee2. on 17 Jun 10, 21:44:00
Hi, Dr. Z Could you explain subcool method of charging , for me please? step by step

Thanks Doc. I ...
By: Zap851. on 25 Jan 10, 03:37:09
Thanks Doc. I needed a refresher.

recoed video where ...
By: Iranisgreatcountry. on 13 Jan 10, 01:51:00
recoed video where is quite , use the HD camcorder, transfer edited by Magic movies edire pro ...

WHY DONT U FUCK DR.Z
By: brrach. on 13 Dec 09, 23:43:22
WHY DONT U FUCK DR.Z

It would probably ...
By: DrZarkloff. on 21 Nov 09, 15:06:53
It would probably work okay in the summer, but then it could become a problem in cooler weather.

Dear Dr. Zarkloff, ...
By: manolitoist. on 21 Nov 09, 14:57:18
Dear Dr. Zarkloff, I would ask if it is possible to replace a 2horsepower window type unit to a 2.5 horsepower in the same unit? My aim is to increase the cooling capacity of the unit. Thank you and more power! Lito Pabalan

One side is the low ...
By: DrZarkloff. on 24 Sep 09, 20:57:48
One side is the low side and the other is the hight side.

thank you ...
By: WADI1122. on 23 Sep 09, 05:10:02
thank you DrZarkloff for the video, although I am not an ac tech but I have learned a lot about ac from your videos, question regarding the valve manifold, when both valves are fully open are both sides" the high and the low are open to ach others" thats how I understood it" the other question is why do we have two fittings in each side? and sorry for the poor English as it is not my 1st language thanks again

Thanks for watching.
By: DrZarkloff. on 17 Sep 09, 23:01:00
Thanks for watching.

Cool. I hope this ...
By: DrZarkloff. on 17 Sep 09, 23:00:39
Cool. I hope this helped.

Thank you very much.
By: DrZarkloff. on 17 Sep 09, 23:00:23
Thank you very much.

Dr. Z, Thanks for ...
By: Rock4660. on 17 Sep 09, 01:27:44
Dr. Z, Thanks for your Video. You are a good instructor and I have learned a lot about HVAC from your video. Keep up, again thank you for your times.

i go to school for ...
By: Kelz1544. on 13 Sep 09, 17:31:24
i go to school for hvac and we are learning this now

Dr Zarkloff u r ...
By: gago9090. on 13 Sep 09, 16:26:58
Dr Zarkloff u r great man in hvac industry good work make more video thank u

Thanks. I will.
By: DrZarkloff. on 12 Sep 09, 14:33:20
Thanks. I will.

HVAC Blower not working, troubleshooting Fan Control board
Posted by: mikie2501

Video duration: 493 seconds
Global video hits: 94472

A quick easy way to trouble shoot most fan control boards to determine if the blower motor is working or if it is the control board

Related: blower, motor, fan, control, board, hvac, not, working, troubleshooting, no, air, airflow

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Latest comments made on this video:

I just installed a ...
By: huskerbird1. on 02 Sep 10, 20:27:27
I just installed a used unit, it worked for two weeks, then quit, in the lower left hand corner of the circuit board Its toasted, I did have two green lights, Now nothing, have od=rdered another board but am worried that what got the first on is laying in wait for my new board. loose neutral kill it? any suggestions? I dont want to blow up another board and busks.

@iac821 Condener ...
By: mikie2501. on 17 Aug 10, 19:13:16
@iac821 Condener motor being the outside fan motor (just verifying our terminology here!) ....check the fan capacitor again to make sure it is ok, if the reading goes up and down and up and down on the cap then it might be a bad cap, I get those once in a while. If the capacitor is good and it it si the right cap for the motor then check the motor, sometimes I will see people put 1075rpm motors on units that SHOULD have 825rpm motors and they can't keep up. Right size motor? M@

my condensor motor ...
By: iac821. on 17 Aug 10, 00:20:47
my condensor motor is stopping after ten fifteen minutes due to heat(cant touch the top of unit) I have replaced the motor and capacitator with no luck. At night it runs longer but still shuts down. Could this be relay switch or circuit board. When its running it runs cold as hell but only for short times

@teachmebetter If ...
By: mikie2501. on 13 Aug 10, 13:56:18
@teachmebetter If the air handler is blowing the breaker that quickly then you might have a high voltage short to ground. It could be something less dangerous but I suggest you call in a professional so that you don't electrocute yourself. I've had a few close calls from loose wiring that was difficult to see etc. So just be safe and make sure by getting a tech to look at this one! m@

hi Mikie2501, I ...
By: teachmebetter. on 13 Aug 10, 09:20:36
hi Mikie2501, I have problem w/ air handling system. the fan does not run. when checking the circuit breaker for air handling it tripped, I reset it but it trips again in less than 5 seconds. do you have any ideas what cause the breaker tripped. I went to the attic and inspected the control board, but could not figure out where the short circuit occurred. please help

great viv mike ...
By: grego10r. on 28 Jul 10, 20:33:28
great viv mike thanks

Thanks for the ...
By: EA0223429. on 27 Jul 10, 11:36:59
Thanks for the awesome idea. So the fan option of the board was bad. You bypassed the board to run the blower direct until the part came in. My only concern would be the constant operation of the blower. Great stuff. I worked on a similar circuit board but it was a much more simple fix. Dog had bit the 24 volt wires at the outdoor unit which in turn popped the fuse. I replaced it and it was good. Keep posting circuit board trouble shooting. Schooling does not teach too much on this area Thanks.

my issue is that ...
By: AFSGWR. on 23 Jul 10, 19:30:53
my issue is that the blower on my Lennox G40UH with a surelink circuit board only seems to run in low speed. I tried a direct connection like you filmed and got the same low speed. the led indicators on the circuit board indicate everything is OK, but the blower won't kick into high gear.

This worked for me. ...
By: rxdxh. on 18 Jul 10, 18:38:15
This worked for me. Thanks for sharing. -Ryan

@CactusBobsPlace ...
By: frexro. on 12 Jul 10, 00:36:50
@CactusBobsPlace get over yourself. This video is VERY helpful unlike your useless nitpicking comment.

mikie2501, just ...
By: frexro. on 11 Jul 10, 23:42:14
mikie2501, just can't say enough good things about this video. I'm a handy guy, but until I saw this it never clicked how the major parts of my heat/AC work together w/ black box. Our blower stopped 2 days ago in 100F weather while the compressor kept running, and by the time I realized no air was flowing in the house, the furnace room was a mess with moisture & frozen lines everywhere. Today I jumped the cool/high motor wire to 120V line and it was sweet relief. Me, my wife & baby thank you!

mikie2501, just ...
By: frexro. on 11 Jul 10, 23:39:44
mikie2501, just can't say enough good things about this video. I'm a handy guy, but until I saw this it never clicked how the major parts of my heat/AC work together w/ black box. Our blower stopped 2 days ago in 100F weather while the compressor kept running, and by the time I realized no air was flowing in the house, the furnace room was a mess with moisture & frozen lines everywhere. Today I jumped the cool/high motor wire to 120V line and it was sweet relief. Me, my wife & baby thank you!

mikie2501, just ...
By: frexro. on 11 Jul 10, 23:38:32
mikie2501, just can't say enough good things about this video. I'm a handy guy, but until I saw this it never clicked how the major parts of my heat/AC work together w/ black box. Our blower stopped 2 days ago in 100F weather while the compressor kept running, and by the time I realized no air was flowing in the house, the furnace room was a mess with moisture & frozen lines everywhere. Today I jumped the cool/high motor wire to 120V line and it was sweet relief. Me, my wife & baby thank you!

@CactusBobsPlace ...
By: mikie2501. on 11 Jul 10, 15:14:05
@CactusBobsPlace You are correct, when I did the video originally I commented at the beginning of the video that the wiring color was not correct and that the brown and red wires were just what I had at hand at the moment to use as an example on the board.

RED,used for ...
By: CactusBobsPlace. on 11 Jul 10, 08:31:50
RED,used for cooling ? your kidding right !? the kids we train out of tech school know better , FOR THE RECORD : indoor blower red=low . blue=med . black= high .... yellow or white = common for motor .... these colors go back to sometime in the 70s before that it was not so simple . the wires often had number tags the service info would give the purpose for that numbered wire . please fix this video , bad information helps nobody =

keep up the videos ...
By: Darreo1. on 10 Jul 10, 06:50:55
keep up the videos I need this kinda help;)

That white plug ...
By: haivang1. on 05 Jul 10, 14:07:47
That white plug that you unplug from the board with all the colors code wires plug into. Well on my unit when I unplug that plug off from the board my blower work and i can hear my refigerant circulated, but when i plug that plug into the board i still hear refigerant circulated but blower dont come on. Why is that? It a new board also. It is good to had the blower run 24/7? Thanks for advise.

@14KJEWELRYREPAIR I ...
By: mikie2501. on 17 Jun 10, 03:03:35
@14KJEWELRYREPAIR I honlestly don't remember this conversation ...this may require an email with more writing space) Calculates well?? ..if the black lead has continuity to the shell then the motor is shorted to ground. (bad) ...mght email me with the full details again if you haven't already (sorry my memory is horrid!)

I bench tested ...
By: 14KJEWELRYREPAIR. on 16 Jun 10, 11:03:45
I bench tested blower motor as suggested. it calculates well. I omhed out black lead to motor shell, got continuity after pulling motor from unit. originally blower motor did not come on during call for cooling or fan/on. I jumped R to G, still fan did not come on. Please Advice!

@everypipecom It ...
By: beaver1232. on 10 Jun 10, 06:13:47
@everypipecom It might be the actual thermostat that is bad if when u jump the wires they turn on

Thermostat maybe... ...
By: jaepee57. on 09 Jun 10, 04:53:51
Thermostat maybe...whats the voltage of the unit and control voltage? Transformer might be wired 230 instead of 208 v causing not enough va to pull in both relay coils.

for some reason my ...
By: everypipecom. on 27 May 10, 23:28:06
for some reason my blower stopped working i unplugged G and R and jumped G to R then the fan would kick on but the compressor wouldnt work, then i put the wires back and the compressor works but not the fan, I plugg 2 wires into the R and both the fan and compressor and working now. Any idea what could be my problem ? relay ? how do i trouble shoot that.

@tkbone69 You can ...
By: mikie2501. on 01 May 10, 21:35:36
@tkbone69 You can do that. Removes remaining cool air from the duct system (or warm air) and get a little extra out of it :>

Hey I got a quick ...
By: partypalooza5. on 01 May 10, 19:11:30
Hey I got a quick question, I have that exact board you demonstrated with in this video. There is a jumper setting for the fan time delay, its set at 0 by the factory (meaning it turns off when the condensing unit turns off) why can't it be set at 80 seconds? (the other setting) Wouldn't it be more efficient?

thanks keep making ...
By: tkbone69. on 28 Apr 10, 17:12:47
thanks keep making these videos again thanks ;)

HVAC Troubleshooting 1
Posted by: DrZarkloff

Video duration: 524 seconds
Global video hits: 39687

This is the first troubleshooting video.

Related: drzarkloff, starkloff, hvac, troubleshooting, gauges

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Latest comments made on this video:

@luxaire350 It ...
By: DrZarkloff. on 04 Sep 10, 22:11:01
@luxaire350 It sounds like your compressor valve reeds are bad. I'd replace the compressor.

@pinkfeet970 Sorry, ...
By: DrZarkloff. on 04 Sep 10, 22:09:48
@pinkfeet970 Sorry, I don't have any furnace videos.

I 'm RVDA certified ...
By: pinkfeet970. on 03 Sep 10, 00:43:59
I 'm RVDA certified, A local heating and air company charged my fatherin law $800.00 to fix his furnace. It hasn't worked since the guy brought his cowoker or buddy came out several times according to my father in law. I'm comin in on the back side of this with my experience I find the ignition board 2 be bad the diode in what we tech's call a DSI board Moast of the techs in my field have a Fenwell board tester is there such thing in the HVAC world or where can i see ur video for that? thanks

Dr Z I have a ...
By: luxaire350. on 02 Sep 10, 14:26:08
Dr Z I have a problem with a unit my Delta T is around 10 ..my suction pressure is 85 psi my head is around 210... Ive cleaned both coil's ,,,evacuated and re charged ,,,still no good ..pumped down to 1 psi to see if valves are bad could it be the filter dryer ?

ok thanks
By: seabass3211. on 20 Aug 10, 01:17:32
ok thanks

I sorry, but this ...
By: newstart49. on 19 Aug 10, 21:45:19
I sorry, but this is just unprofessionally done. I've enjoyed the more informative ones.

@seabass3211 ...
By: DrZarkloff. on 19 Aug 10, 20:55:34
@seabass3211 Congrats on making the decision to make HVAC your career. Your instructor will probably tell you what hand tools you'll need.

Thanks for your ...
By: seabass3211. on 18 Aug 10, 12:23:06
Thanks for your vids, I'm starting school for HVAC this month and I'm 35. Any word of advice you can give and what tool I should really need. Thanks again man.

There is much worse ...
By: ciabrenn. on 13 Aug 10, 00:47:59
There is much worse things she could do!!!! Thanks!!!

these people are ...
By: cigamlooc. on 10 Aug 10, 01:34:00
these people are just crazy and love to take up my time with putting on their little skits wait until his wife gets on she thinks she is a comedian and I have not figured him out yet and won't because no more viewing you!!

DO NOT flip an A/C ...
By: tenbadhabbits. on 10 Aug 10, 00:54:04
DO NOT flip an A/C breaker on if it is tripped! You should call a licensed HVAC technician to trouble shoot the problem. When a breaker trips it is for a reason. Find the reason it tripped before re-tripping the breaker. For example, if a grounded compressor tripped the breaker, then you could blow the freon charge by re-tripping it.

You know how there ...
By: fedders4. on 26 Jul 10, 01:07:11
You know how there is three wires in a 115volt power cord, is it true that you can split the hot wire in two, to make two hot wire conections to a 230volt DC inverter air conditioner? will that work or do i? still have to call the elecrical guy?( A/C Unit is a 9,000 BTU Ductless mini split heat pump with a DC inverter compressor and it only draws 15 amps and uses 230volts)

@DrZarkloff too ...
By: jayguy173. on 17 Jul 10, 22:04:15
@DrZarkloff too werid for me

big girl
By: jayguy173. on 17 Jul 10, 22:03:20
big girl

@deyenak1 If you ...
By: DrZarkloff. on 16 Jul 10, 15:58:44
@deyenak1 If you think that she is nutty in this video, you need to check out her channel DearestBecky.

your wife is nutty ...
By: deyenak1. on 16 Jul 10, 04:03:00
your wife is nutty on this video

WTF IS GOING ON AT ...
By: niper99. on 14 Jul 10, 06:13:46
WTF IS GOING ON AT THE END THIS VIDEO!!!!....ANYWAYS REALLY GOOD INFO ON YOUR VIDEO VERY HELPFULL AND VERY WELL EXPLAINED.

@cruz47144 Thanks ...
By: DrZarkloff. on 02 Jul 10, 21:45:01
@cruz47144 Thanks for watching.

Thanks for posting ...
By: cruz47144. on 02 Jul 10, 18:58:47
Thanks for posting your videos. I'm a electrician by trade but have always been fascinated by HVAC. I use to listen to cooltalk online before discovering your videos. Installed my own complete system and I got certified on refrigerants. Saved a ton of money. I'm grateful for learning more. I service my families systems.

@mxdunksdad You ...
By: DrZarkloff. on 22 Jun 10, 23:57:29
@mxdunksdad You really should replace the bad high pressure switch. You might want to clean the coil in your out door unit. It's easy to do. Just turn off the power to the unit and use a hose to clean the coil. Coil cleaner isn't always a necessity unless the coil is really a mess. It is possible for a dirty coil to be why your condensing unit is shutting down on high pressure.

HI DrZ, I have ...
By: mxdunksdad. on 17 Jun 10, 20:02:03
HI DrZ, I have looked at all your videos to try and fix my outside unit a 3.5 ton Ducane split AC. The condenser stopped running ( heat pump ) it was not heating the AC guy came out and snipped the two HIGH pressure wires and tied them together the only way it would come on connect it and the little spring switch wont engage. The problem is the High pressure now overheats and stops cooling I have had three guys out and they cant tell me what to do any advice ? i ran the heat and temp drops to

@vector00234 when ...
By: kolocho7777. on 01 Jun 10, 13:29:45
@vector00234 when checking the HP switch and LP switch, do you have to disconect both wires or only one?

@jrm1559 Thanks for ...
By: DrZarkloff. on 04 May 10, 00:31:41
@jrm1559 Thanks for watching.

Dr. Z is a great ...
By: jrm1559. on 29 Apr 10, 22:19:27
Dr. Z is a great HVAC/R. The problem I had with this video is that it jumped/skipped. I was trying to very closely follow but the video seemed to jump and I may have missed something critical to know. I appreciate Dr. Z.

I was just told by ...
By: djslay34982. on 27 Apr 10, 00:50:45
I was just told by my Instructor to always put the gauges on and check the pressure.

HVAC compressor change
Posted by: DrZarkloff

Video duration: 348 seconds
Global video hits: 57229

I tried to make this a step by step how to change a compressor video. Darn batteries in my camera went dead in the middle of the show. Maybe next time.

Related: hvac, starkloff, drzarkloff, air, conditioning

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Latest comments made on this video:

@lrlthomas It is ...
By: mysexywifeli. on 25 Aug 10, 04:16:39
@lrlthomas It is recomended that you change drier everytime you open system

Dr.Z , student here ...
By: remdremd. on 29 Jul 10, 22:41:21
Dr.Z , student here. Wouldn't your expected head pressure at 95 degrees ambient temp be about 276 psi? Also I calculated 7 degrees SC. Is this correct? Thanks

@tavanhna Thanks. ...
By: DrZarkloff. on 17 Jul 10, 19:07:56
@tavanhna Thanks. I'll get to that topic soon.

hi dr zarkloff i ...
By: tavanhna. on 09 Jul 10, 03:07:21
hi dr zarkloff i like to know about high pressure switch. how to change out one if it's bad. please help

About 4 degrees ...
By: THEHVACTECH101. on 07 Jul 10, 17:33:40
About 4 degrees subcooling with r22

hi dr Zarkloff! ...
By: laotian123. on 05 Jul 10, 02:47:20
hi dr Zarkloff! I'm an hvac student, i"v been watching and learn alot from your videos. thanks. On this video, you asked what the subcooling is? but you didn"t not say what type of refrigerant is. I 'll just assuming is R-22. So my answer is 7 degree subcooling. It seems like the system has low head pressure. correct me if i'm wrong. thanks

@lrlthomas why ...
By: lrlthomas. on 04 Jul 10, 20:40:18
@lrlthomas why didn't you put the drier exterior to the unit and install 1 ball valve even though you wouldn't need it if the system could pump down. total waste of time and a locked up compressor doesn't mean acid or burned windings so why change the drier?

@lrlthomas I dried ...
By: DrZarkloff. on 04 Jul 10, 07:17:22
@lrlthomas I dried the system with the vacuum pump. I installed the ball valves so that I could pump down the system and replace the filter drier the following week.

@DrZarkloff you"re ...
By: lrlthomas. on 03 Jul 10, 21:06:40
@DrZarkloff you"re not drying the system out with nitro. No service tech in their right mind would install ball valves to isolate components too much time and cost. You must be charging a fortune for your repairs. By the way most newer units have a high pressure switch and a loss of charge so usually the cause of compressor failure is due to icing up or electrical problems.

@tangnatalaga ...
By: DrZarkloff. on 23 Jun 10, 00:16:22
@tangnatalaga Compressor failure can be due to a refrigerant under or over charge, poorly designed duct, not removing the moisture properly with a vacuum pump upon the initial installation, not having simple safety switches like a low and high pressure switch and not having a compressor time delay in place. There are many others. These are just a few.

jeez in the beging ...
By: Asif410. on 21 Jun 10, 09:00:40
jeez in the beging of video you made me worry you almost sound like ur help were KIA :) nice video i,ve learn lot from ur videos thnx.

My mistake, I meant ...
By: Gcarman50. on 20 Jun 10, 16:42:34
My mistake, I meant Delta T.

@Gcarman50 delta t ...
By: heyjustthetip. on 18 Jun 10, 16:13:33
@Gcarman50 delta t is the change in temperature right? i ve heard of a delta tree used to organize data...but i dont see what a delta tree would be usefull here. did u mean delta t cuz i understand what delta t which is the overall change in temp.

In your experience, ...
By: tangnatalaga. on 18 Jun 10, 12:36:52
In your experience, what are the common cause of premature compressor failure?

@BQPhotos I live in ...
By: DrZarkloff. on 03 Jun 10, 23:35:57
@BQPhotos I live in the Gainesville, Florida area. How about you?

@Gcarman50 The ...
By: DrZarkloff. on 03 Jun 10, 22:15:00
@Gcarman50 The Delta T is calculated by subtracting the supply air temperature from the return air temperature.

@Gcarman50 The ...
By: DrZarkloff. on 03 Jun 10, 22:14:54
@Gcarman50 The Delta T is calculated by subtracting the supply air temperature from the return air temperature.

@Gcarman50 The ...
By: DrZarkloff. on 03 Jun 10, 22:14:48
@Gcarman50 The Delta T is calculated by subtracting the supply air temperature from the return air temperature.

@Gcarman50 The ...
By: DrZarkloff. on 03 Jun 10, 22:14:41
@Gcarman50 The Delta T is calculated by subtracting the supply air temperature from the return air temperature.

@Gcarman50 The ...
By: DrZarkloff. on 03 Jun 10, 22:10:32
@Gcarman50 The Delta T is calculated by subtracting the supply air temperature from the return air temperature.

Hi DrZarkloff, Love ...
By: Gcarman50. on 03 Jun 10, 17:16:46
Hi DrZarkloff, Love you video's. I just finished HVAC schooling 2 months ago. I'm viewing the last comment the one that Lodizal03 posted 6 posting ago. He stated that the Delta tree was 20 Degrees. How did he figure that out when you didn't state what the indoor wet bulb was, To be able to figure out Proper air flow you need the indoor entering wet and dry bulb readings to figure out the leaving air temperature. To be able to determine the proper Delta tree. Please reply

Your how to videos ...
By: BQPhotos. on 01 Jun 10, 13:49:11
Your how to videos are the best ! Do you have video on replacing a Frigidaire frs26h5asb compressor. If not, I have one that needs replacing and I'm willing to do the video work. I have all the video equiptment (Cameras, Lights, Lapel Mics, Etc) to provide a quality video.

@andyf22004 It is ...
By: tenbadhabbits. on 11 May 10, 17:06:03
@andyf22004 It is obviously R-22

76 over 230 on a 95 ...
By: Lodizal03. on 06 May 10, 00:44:34
76 over 230 on a 95 degree day is damn good pressures...condensor coil is clean..evap is clean...with a 106 degree liq line...u should be getting 20 degree delta T

well it depends if ...
By: andyf22004. on 25 Apr 10, 03:51:32
well it depends if it is r-22 or r-410a

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